I've been trying to find the words to describe that art in a polite manner, but I'm struggling. Truthfully, I think it looks horrendous. The art doesn't seem to have any particular theme going for it (snow, cave, water, bricks, weird orbs etc), the background and foreground clash so badly that if you were to take Sonic out of the picture, I couldn't even begin to tell you which is which and the palette choice feels bland and uninspired. Using so much transparency on the foreground is a big no no, because all it does it make it hard to tell what is foreground and what isn't. If you want to give something a transparency effect, put some highlights into it to give an effect of reflecting light to at least make is stand out a bit. Onto the other parts of the video now, the SSRG screen looks awful as you seem to only be using a single line of the palette for the entire screen. It actually looks like a very badly converted image. As for the "new title screen", it actually looks like a broken mess. I can only assume that the title screen is unfinished, but if that's the case, I wouldn't have drawn attention to it in the title of your video. All in all, this needs a hell of a lot of work to make it look decent. I understand you're trying to improve the art, but I think you should pay attention to how other zones have been constructed in terms of palette choice and art style before getting too involved with the current art choice. Look towards the original games and hacks such as The Next Level, S Factor and other hacks with major art mods and you should pick up some tricks to help you improve.